注塑机拉杆三角螺纹端卸载槽的多目标优化  

Multi-objective Optimization of the Slot for Releasing Stress of the Tri-thread End of a Tie-bar of a Plastic Injection Machine

作　　者：欧笛声[1] 周雄新[1] 

机构地区：[1]广西工学院机械系,广西柳州545006

出　　处：《中国塑料》2007年第1期99-102,共4页China Plastics

基　　金：广西壮族自治区教育厅科研项目（200508156）

摘　　要：针对注塑机拉杆三角螺纹在近卸载槽处发生早期断裂的问题，在用ANSYS软件对近卸载槽处三角螺纹进行有限元分析的基础上，就拉杆三角螺纹端卸载槽的几何特性建立参数优化模型，以控制三角螺纹在近卸载槽附近的最大应力、卸载槽的最大应力以及卸载槽加工量最小化为统一的目标函数。通过对拉杆在单向拉伸力作用下的多目标优化，可使拉杆三角螺纹牙根在卸载槽处的最大应力降低55％，在偏载作用下，其最大应力降低21．4％。在单向拉伸力作用下，拉杆卸载槽的最大应力比平均单向拉伸应力提高26．5％，使卸载槽能够较好地发挥其卸载的作用。Aimed to the premature failure of the tri-thread near a slot for releasing stress of a tie-bar of a plastic injection machine, this paper analyzed the stress distribution of the tri-thread and its adjacent slot of a tie-bar with finite dement method in ANSYS software, and built up a parameter optimum model according to the geometry characteristic of the adjacent slot of the tri-thread end of a tie-bar. A multi-objective function was used to reduce the maximum stress of a tri-thread and to control the maximum stress and the minimum machining allowance of its adjacent slot of a tie bar. Through the multi-objective optimization of the parameters of a tie-bar under the condition of one-way tension, the maximum stress on the root near the slot of the tri-thread of a tie-bar decreases 55 percent. Under the condition of deflective load, its maximum stress decreases 21.4 percent. Under the condition of one-way tension, the maximum stress of the slot of a tie-bar increases 26.5 percent in comparison with the average one-way tensile stress. It demonstrates that the optimum method can make the slot play a better role on releasing stress.

关 键 词：注塑机 拉杆 卸载槽 多目标优化 三角螺纹 

分 类 号：TP122[自动化与计算机技术—控制理论与控制工程]